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Text Deduplication

In one line: Paste a messy multi-line list and get back only the unique lines, with a count of how many duplicates were removed.

When to use

  • Cleaning keyword lists before building product titles or ad campaigns
  • De-duplicating SKU or ASIN lists pulled from multiple exports
  • Tidying email or recipient lists before a bulk send

Inputs

Field Notes
Text Multi-line text, one item per line
Trim whitespace Strips leading/trailing spaces so " sku" and "sku" count as the same
Ignore case Treats "SKU-001" and "sku-001" as duplicates

Outputs

  • De-duplicated lines (ready to copy)
  • Duplicates removed (count)
  • Unique-line count

Steps

  1. Open https://www.niceggie.com/tools/text/deduplication
  2. Paste your list into the text box, one item per line
  3. Toggle Trim whitespace and Ignore case as needed
  4. Copy the de-duplicated result and check the removed/unique counts

Trim before you dedupe

Stray trailing spaces and tabs from spreadsheet exports are the most common reason "identical" lines don't match. Turn on Trim whitespace first, then Ignore case if your IDs are case-insensitive.

FAQ

Does it keep the original order of my lines?

Yes. The first occurrence of each unique line is kept in its original position; only the later duplicates are dropped, so your list order is preserved.

Will it remove blank lines?

Duplicate blank lines collapse into one (or are trimmed away if Trim whitespace is on). A single intentional blank line between sections is left intact.

Pair with